0
Q
Joule
A
Unit for measuring energy
1
Q
Power
A
Rate of change of energy
Rate work is done
2
Q
Watt (W)
A
I joule of energy is used every second
W=J/s
3
Q
Electrical power
A
Rate at which electricity is being used
P= VI
4
Q
Power rating
A
How much electrical energy a device uses every second
5
Q
Energy consumption
A
How much energy is used in the time we use a load
E=Pt. t is in seconds
6
Q
Kilowatt-hour
A
A practical unit for measuring electrical use
1 kilowatt-hr means 1 kilowatt was used every hour
Science 9 Electricity Unit
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